A major gold province of the world exists in the Proterozoic Birimian and Tarkwaian supracrustal rocks of West Africa. The bulk of the gold comes from the …
The Tarkwaian consists of coarse clastic sediments derived from Birimian and granitoid source rocks.Early formed structures in Birimian and Tarkwaian rocks include upright sub-horizontal to gently ...
the various rock units and may be required to correlate between observations, but mineralogical classifications are not desirable as a rock unit name unless the mineral constituents or fabric are significant to engineering properties. The classification for igneous, sedimentary, metamorphic, and pyroclastic rocks is shown on figures 4-1, 4-2, 4 ...
Paleoproterozoic Birimian Supergroup rocks of southwest Ghana host numerous mesothermal lode gold deposits, including the >38 million ounce (Moz) Ashanti deposit at Obuasi and other multimillion ounce deposits at Bogoso, Konongo, Prestea, Bibiani, and in the Yamfo-Sefwi region. Gold deposits of the Chirano district are localized along the …
Konongo area, the northeastern part of the Ashanli volcanic belt (Kutu, unpublished) have revealed that some of the belt-typegranitoids show S-type ... sedimentary rocks (Le., …
In terms of the geology of the area, the series includes rocks from the Upper Birimian Series and Tarkwaian System within the Konongo Project area . The Tarkwaian rocks are found as an infolded synclinal formation that is bordered by the Upper Birimian to the northwest and southeast. The Upper Birimian is thought to be represented by the ...
The Tarkwaian deposits of the Birimian belt of Houndé are located in the Baoule-Mossi Paleoproterozoic area of the West African Craton. The sedimentary units consist of sandstone heterometric pelitic …
This research has re- debate. vealed a consistent pattern of geostructural and metallo- genic evolution in which both the Birimian and the Tark- waian rocks were deformed by a major Eburnean com- Geological setting pression (D2).
˜ e West African Precambrian Shield is a tectonic province dominated by two Lower Proterozoic volcano/sedimentary sequences that are important for the occurrence of gold mesothermal mineralization, the Birimian Supergroup and the Tarkwaian Group (Fig- ure 1). ˜ e Birimian, a dominantly marine tur- bidite series, is composed largely of phyllites, …
Adamus Resources Limited (Nzema Gold Mine) is located approximately 300km west-southwest by road from the Capital City Accra, and 80km west by road from the port of Takoradi. Adamus Resources Limited is the first mine to be owned by Nguvu Mining. The mine was acquired from Endeavour Mining in 2017.
Paleoproterozoic Birimian Supergroup rocks of southwest Ghana host numerous mesothermal lode gold deposits, including the >38 million ounce (Moz) Ashanti deposit …
associated with outcrops of the Upper Birimian rocks. One area of intense concentration is along the margins of the main Tarkwaian trough (Fig. 1). Gold occurs along the western margin of the trough and has been mined at various localities from Axim through Akanko, Prestea and Obuasi to Konongo, a distance of about 200 km. Mining
USGS
Tarkwaian Group The Tarkwaian Group rocks which are rich paleoplacer deposits, preserved mainly in the Ashanti Belt are composed of clastic sediments, mostly quartzite, arkose, conglomerate and phyllite. Most extensive occurrences are in the Ashanti and Bui belts. 2132 ± 3 Ma to 2096 Ma Gold-bearing quartz conglomerates,
Rocks of early Proterozoic age (ca. 2100 Ma) host the major gold deposits in Ghana. The deposits are either located in mesothermal quartz vein systems or hosted in a quartz pebble conglomerate that represents a paleoplacer. Both types of mineralisation are largely confined to the Ashanti Belt, one of four parallel northeast-trending volcanic belts. While …
The Tarkwaian deposits of the Birimian belt of Houndé are located in the Baoule-Mossi Paleoproterozoic area of the West African Craton. The sedimentary units consist of sandstone heterometric pelitic feldspthic sandstone with locally interbedded breccias, puddings and polygenic conglomerates. Lithic pebbles and macroscopic …
These rocks have experienced greenschist to amphibolite grade metamorphic facies (Kesse, 1985). Locally, the Birimian is subdivided into a lower unit of metamorphosed sedimentary rocks and the upper unit composed of volcanic rocks. Tarkwaian elastic sediments (dated 1900 Ma) overlie the Birimian unconformably.
Electron microprobe analysis was carried out on carbonates in country rocks from Ashanti and Prestea mines of the Ashanti gold belt of the Birimian in southern Ghana. Results showed that the...
The Konongo Gold Project is located on the western margin of the 125Moz Ashanti Gold Belt in Ghana, West Africa. Itis situated 60km along strike of the world-class mineral system at Obuasi and is...
The Tarkwaian system and the Basic Intrusives make the remaining 2% of the underlying rocks in the region (Kesse, 1985). 1).Rocks of the Tarkwaian outcrop in a NE-SW trending belt and are considered of molassic facies derived from the older Birimian System (Junner and others 1942).They are formed in elongated intra-cratonic basins, which ...
The Konongo gold project is located around the coordinate 735,419N and 698,988E in the UTM WGS84 projection system. The area is in the Ashanti Region, about 165 km northwest of Accra, the capital of Ghana. It is in …
Konongo area, the northeastern part of the Ashanli volcanic belt (Kutu, unpublished) have revealed that some of the belt-typegranitoids show S-type ... sedimentary rocks (Le., Tarkwaian), and both formations were subjected to a single progressive deformationevent,which involvedcompression along
Tarkwaian Group sedimentary rocks which include the gold-bearing Banket Series conglomerates are generally confined to belts of Birimian mafic volcanic rocks, either in unconformable...
The area contains two distinct limbs of Birimian rocks which have been folded about a NE trending synclinal fold axis. A central core of Tarkwaian sediments is present which dies out to the south. The western limb of this syncline hosts the Konongo deposit to the NE.
The principal gold producing areas of Ghana occur within Palaeoproterozoic Birimian meta-volcanic and meta-sedimentary rocks, and within the marginally younger, overlying Tarkwaian meta-sedimentary succession. The giant 40+ million ounce (Moz) Ashanti deposit at Obuasi and 38+ Moz deposit at Tarkwa are 2 monstrous examples …
Our current research outlines the stratigraphy, structure, approximate age and depositional setting of the volcaniclastic sequence in the Cape Three Points area in Ghana, West Africa.Axim-Konongo (Ashanti) belt is composed of mainly andesitic basalts, volcaniclastic rocks and belt type granitoids, which are unconformably overlain by Tarkwaian …
The erosion products were deposited as sediments of the Tarkwaian Group in long, narrow intramontane grabens which formed due to rifting preferentially in the central portions of all five Birimian volcanic belts. ... Pb-Pb and Rb-Sr data of volcanic and plutonic rocks are incorporated. ... On the structure of Konongo gold mines, the structural ...
Bogoso, Ayanfuri, Amansie, Konongo, Yamfo and Mpohor (Father Brown) gold deposits among others. Gold deposits in the Tarkwaian include mines at Abosso, Tarkwa, and Iduapriem. The Ashanti belt is one of the Birimian volcanic belts in Ghana. ... Birimian and Tarkwaian rocks was established during the "Eburnian 2" orogeny (Allibone, et al ...
The geology of the Konongo mine is found to consist of a series of metavolcanic rock units at the central and eastern part of the area, metasedimentary rocks unit at the western part and Tarkwaian …
Two major epigenetic gold-forming events are recorded in the world-class gold province of southwest Ghana. A pre-Tarkwaian event was the source of the world-class Tarkwa palaeoplacers whereas post-Birimian and Tarkwaian deformation, which was related to the Eburnean orogeny, gave rise to the world-class (e.g. Prestea) to giant (e.g. …
According to Layton ( 1958 ), rocks in the Mankwadzi area consist of "greenstones" (mostly quartz–hornblende–actinolite schists and amphibolites) and hornblende–biotite quartz schists (Figure 2 ). The rocks trend northeast and dip steeply between 70° and 84° to the southeast.
plutonic rocks; Precambrian; Proterozoic; quartz veins; S-34/S-32; shear zones; stable isotopes; stockwork deposits; sulfur; temperature; upper Precambrian; …
Konongo, Ashanti gold belt, Western Region, Ghana : ... P., Ankrah, P., Johan, V., Marcoux, E., & Vinchon, C. (1991). The metallogenic relationship between Birimian and Tarkwaian gold deposits in Ghana. ... This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively ...
Ghana is divided into five geological domains or provinces on the basis of age, tectonics andlithologiccharacteristicsof the supra-crustal rocks. These are; 1. The Western Unit, which lies at the eastern margin of the Precambrian Western Shield or Craton.2. The South Eastern Unit, which is at the southeastern part of the country …
50 rowsAccording to Layton ( 1958 ), rocks in the Mankwadzi area …